Dynamics In A Speaker

Spencer, did you manage to get in contact with somebody for your ESLs? sorry i realize it's off-topic.....  

besides what Duke (audiokinesis) wrote about the importance of not putting the drivers into mechanical compression, I think that ivan_nosnibor brings up an important point - cross-overs.
For me the most dynamic speakers are time-coherent speakers that use a 1st-order internal x-over. Not saying that an external x-over would have been better but I’ve not heard a time-coherent speaker w/ an external x-over so I cannot comment.
Assuming that the speaker designer chooses the drivers correctly so as to not induce mechanical compression, dynamics in speaker comes from its actual design....